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VERSION:2.0
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SUMMARY:Confinement in QED
DTSTART:20230301T143000Z
DTEND:20230301T160000Z
DTSTAMP:20260624T022604Z
UID:800272ec-58f4-4405-8428-4eeac75e5ffc
SEQUENCE:2
CREATED:20230222T152238Z
DESCRIPTION:It is believed that in QCD its fundamental constituints are co
 nfined\, i.e. that the Hilbertspace of the physics states does not include
  single quark or gluon states. How thisproperties translates into two poin
 t correlation functions is not clear. Certainly\,positivity violation is a
 n indication of confinement. Do we have other theories whereconfinement ta
 kes place? Indeed\, this happens for the compact formulation on latticeof 
 QED that has two phases: a confined and a non-confined phase. Then\, how d
 o theparticle propagators look like in each phase? What about positivity v
 iolation? In orderto help answering these questions\, we revist the photon
  propagator for the puregauge theory. In the confined case we show that it
  has an associated linearly growingpotential\, it has a mass gap\, that is
  related to the presence of monopoles\, and itsspectral function is not po
 sitive defined. In the non-confining phase\, our simulationssuggest that a
  free field theory is recovered in the thermodynamic limit.
LAST-MODIFIED:20230222T154707Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/orlando-oliveira/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="91gps">It is believed that
  in QCD its fundamental constituints are confined\, i.e. that the Hilberts
 pace of the physics states does not include single quark or gluon states. 
 How thisproperties translates into two point correlation functions is not 
 clear.<br/><br/> Certainly\,positivity violation is an indication of confi
 nement. Do we have other theories whereconfinement takes place? Indeed\, t
 his happens for the compact formulation on latticeof QED that has two phas
 es: a confined and a non-confined phase.<br/><br/> Then\, how do thepartic
 le propagators look like in each phase? What about positivity violation? I
 n orderto help answering these questions\, we revist the photon propagator
  for the puregauge theory.<br/><br/> In the confined case we show that it 
 has an associated linearly growingpotential\, it has a mass gap\, that is 
 related to the presence of monopoles\, and itsspectral function is not pos
 itive defined. In the non-confining phase\, our simulationssuggest that a 
 free field theory is recovered in the thermodynamic limit.</p>
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